Notice: Undefined index: so_sociallogin_linkdinapikey in /home/volkanelektronik/public_html/catalog/controller/extension/module/so_sociallogin.php on line 476Notice: Undefined index: so_sociallogin_linkdinsecretapi in /home/volkanelektronik/public_html/catalog/controller/extension/module/so_sociallogin.php on line 478Please go to LinkedIn Apps page https://www.linkedin.com/secure/developer?newapp= , create an application, and in the line 477 set the client_id to Consumer key and client_secret with Consumer secret. The Callback URL must be https://www.volkanelektronik.com/index.php?route=extension/module/so_sociallogin/LinkedinLogin Make sure you enable the necessary permissions to execute the API calls your application needs.